title: Presurgical imaging with indium-labeled anti-carcinoembryonic antigen for colon cancer staging.
abstract: Over a 4-year period, 108 patients with known or suspected colorectal cancer were studied by radioimmunoconjugate scintigraphy prior to operative procedures. Study subjects received 0.2 to 40 mg i.v. of murine anti-carcinoembryonic antigen monoclonal antibody labeled with 2-5 mCi of 111In (Indacea). Resected tissues were analyzed for 111In and carcinoembryonic antigen content. Tumor, liver, and draining lymph nodes had over 10% injected dose/kg compared to less than 2.5% injected dose/kg for other normal tissues. Primary tumors that were successfully imaged were significantly larger and had higher 111In and carcinoembryonic antigen content. In 54 patients, primary tumors were visualized with a sensitivity of 78%. Hepatic metastases (58 patients) were visualized as negative filling defects (sensitivity, 45%). Extrahepatic (intraabdominal) metastases (25 patients) were visualized (sensitivity, 48%) as areas of increased uptake. Extraabdominal metastases were uncommon (10 patients; sensitivity, 80%). Of 56 patients with known or suspected hepatic metastases who presented with no evidence of extrahepatic disease by conventional tests (X-ray, computerized tomographic scan), 20 (36%) were documented to have extrahepatic metastases at exploratory surgery and 10 of these (50%) had the extrahepatic disease localized by the Indacea scan. The management of these 10 patients was, or could have been, modified by the scan findings and unnecessary surgery eliminated.
authors.affiliation: Department of General Oncologic Surgery, City of Hope National Medical Center, Duarte, California 91010.
authors.forename: J D
authors.initials: JD
authors.lastname: Beatty
authors.forename: L E
authors.initials: LE
authors.lastname: Williams
authors.forename: D
authors.initials: D
authors.lastname: Yamauchi
authors.forename: B A
authors.initials: BA
authors.lastname: Morton
authors.forename: L R
authors.initials: LR
authors.lastname: Hill
authors.forename: B G
authors.initials: BG
authors.lastname: Beatty
authors.forename: R J
authors.initials: RJ
authors.lastname: Paxton
authors.forename: B
authors.initials: B
authors.lastname: Merchant
authors.forename: J E
authors.initials: JE
authors.lastname: Shively
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D002272:Carcinoembryonic Antigen / Q000276:immunology*; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D007205:Indium Radioisotopes; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging; D011877:Radionuclide Imaging
chemical_list: D000911:Antibodies, Monoclonal; D002272:Carcinoembryonic Antigen; D007205:Indium Radioisotopes